Dental handpiece



R. E. GRAVES.

DENTAL HANDPIECE. Avmlcmlou FILED wu' 26,1921,

i 1,427,286. Patentedfwg. 29, 1922.

*lesa risica;

lROBERT E. GRAVES, OF HOUSTON, TEXAS.

DENTAL HANDPEECE. 11.

Application filed July 26,

To all wiz/0m it may; comem- Be it known that ROBERT E. GnAvns, a citizen of the Unitedl- States, residine at Houston, in the county of Harris and @tate of Texas, has invented certain` new and useful Improvements in a Dental liandpiece, of which the following is a specification.

This invention relates tov new and useful iinrovements inv a dental hand piece.

ne object of the invention is to provide a dental hand piecey which has beenY specially constructed so that the drill may be quickly and easilyv inserted and removed, andl one which -will securely hold said drill while in use.

Another object is `to provide a dental hand piece which is constructed; of few parts7 which may be easily assembled and taken apart and which will be durable and eilicient.

With the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts an example of which isdescribed in this specilication and illustrated in the accompanying drawings, wherein :M

Figure l shows a side view of the inner sleeve employed. y

Figure 2 shows a side view of the drive shaft.

Figure 3 shows a side view of the chuck. Figure l shows a longitudinal sectional view ofl the assembledk hand piece.

Figure 5 shows a side view of the inner sleeve of another type of hand' piece.

Figure 6 shows a side view of a shaft ein` ployed in this type.

F'gure '7 shows a side view of the chuck. Figure 8 shows a side view of the outer sleeve employed and,

Figure 9 shows a longitudinal sectional view of this type of hand piece.

Referring to the drawingsmore specifically the outer and inner sleeves 1 and 2 are secured together by means of the set screw 3 with the shaft l in place. One end of this shaft has a socket 5 which has a slight outward taper, and its other end is reduced formingan annular shoulder 6 which bears against the hearing flange 7 of the outer sleeve. The reduced end eX- tends through said flange and is threaded to receive the dog` 8` formed to be clutched with the usual driving connection which Specification of Letters Iatent.

Patented Aue., 2391, il

`l92ln Serial No. 457,603.

is screwed onto the reduced threaded end Jfof the outer sleeve. f

rllhe shaft d has a lengthwise slot itl, therethrough7 at the inner end of the socket 5.

The chuck li., in use, is fitted into the socket 5 and` is provided to receive the drill whichis inserted therein and as it is forced inwardly it will strike the inner end of the chuck socket and wedgethe chuck into the socket 5 and the drill will thereby be clamped in the chuck. Pliers` are used to withdraw the drill, but should the drill become stuck the shaft may be removed and an implement insertedv through the slot l() and by its pressure against the inner end of the chuck, said chuck may be moved outwardly and the drill released from the chuck.

ln the other type shown in Figures y5 to 9 inclusive7 the numerals l2 and 13' designate the outer and inner sleeves and the numeral le designates the shaft.

The numeral l5 designates the chuck which is adapted to be inserted in the out wardly tapered socketlb in one end of said shaft. lengthwise slot 17 is cut through the shaft ai; the inner end of said socket and a chuck collar 18 is iitted around the shaft and pinned to the inner end of the chuck by means of a pin 19 which passed through said slot 17. The drill 20 is clamped by the chuck in the usual way. The opposite end of the shaft is reduced forming an annular bearing shoulder 2l which abut-s against an internal annular bearing 22 into which the corresponding end of the outer sleeve, is formed. `Pinned to the reduced endy of the shaft there is a dog` which is formed with a thrust bearing 2e which seats in a bearing recess 25 in the adjacent end of the sleeve 12. Thev dog` is formed to clutch with the usual driving connection which is threaded onto the sleeve l2.`

The outer sleeve l2 has a lengthwise fl'- slot 26, with a central notch 27 and a set screw 28 works in said,l slot and is screwed through the inner sleeve and into a release collar 29 which slides on the sha-ft 14.

lVhen. the drill is inserted iu the chuck the inner sleeve is then grasped .and forced further into the outersleeve` the inner end of the inner sleeve heine spaced from the lbearing 22 to permit this. An innery annualong and the pin i9 will cai the chuck inwardly in the flared socket l5 and cause the chuck to grip the drill. yEhe set screw meanwhile moves in the slot 26 and when the drill is gripped by the chuck the inner sleeve is moved outwardly and turned to lock the set screw in the notch 27.

To release the drill the set screw is unseated from said notch by suitably turning the inner sleeve and thcn said inner sleeve is moved outwardly carrying the release collar 29 against the chuck collar 18 and moving' the chuck outwardly permitting it to expand and release the drill.

This hand piece is composed of few parts, is easily operated, easily assembled and taken apart and will not readily weer out.

l. A dental hand piece including an outer sleeve, an inner sleeve fitted into one end of the outer sleeve, and having a limited lengthwise movement relative thereto, a shaft in the inner sleeve, one end of which has a flared socket, a chuck formed to lit into said socket, a collar connected to the chuck and moveable lengthwise, on the shaft, and actuating means carried by the inner sleeve and on opposite sides of said collar whereby the chuck may be moved in either direction in the socket by a corresponding movement of the inner sleeve, and a locking` device carried by one sleeve and arranged to be engaged with the other sleeve to lock them against relative lengthwise movement,

2. A dental hand piece including an outer sleeve one end of which is formed with an internal annular bearing, an inner sleeve fitted into the other end of said ou ter sleeve, and having a limited lengthwise movement relative thereto, a shaft one end of which is reduced and fitted thr ugh said hearing, and formed with a shoulder which works against said bearing, and the other end of which is formed with a'flared socket,y and a transverse slot, a chuck formed to fit into said socket, collar having a limited lengthwise movement relative to the shaft.` a pin carried by said collar and working through said slot and connected to the chuck, means carried by the inner sleeve and spaced on opposite sides from said collar and operating` against the collar whereby the chuck may be moved in a direction corresponding' to the movement of the inner sleeve.

3. A dental hand piece including an outer sleeve one end of which is formed with an internal annular bearing, an inner sleeve fitted onto the other end of said outer sleeve, and having a limited lengthwise movement relative thereto, a shaft one end of which is reduced and fitted through said. bearing, and formed with a shoulder which works against said bearing, and the other end of Which is formed with a fla-red socket a chuck formed to lit into said socket, a collar having a limited lengthwise movement relative to the shaft and connected to the chuck, means carried by the inner sleeve on opposite sides of said collar and spaced apart whereby the collar and chuck may be moved in a direction corresponding to the movement of the inner sleeve and a locking` device carried by one sleeve and arranged to he engaged with the other sleeve to lock them against relative lengthwise movement.

Ll. A dental hand piece including an outer sleeve one end of which is formed with an internal annular hearing, an inner sleeve fitted into the other end of said outer sleeve, and having a lin'iited lengthwise movement relative thereto, a shaft one end of which is reduced and fitted through said bearing, and formed with a shoulder which works against said bearing, and the other end of which is formed with a flared socket, a chuck formed to iit into said socket, a collar having,` a limited lengthwise movement relative to the shaft and connected to the chuck, means carried by the inner sleeve on opposite sides of said collar and spaced` apart whereby the collar and chuck may be moved in a direction correspondingto the movement of the inner sleeve, the outer sleeve having a T-slot and a set 'screw carried by the inner sleeve, and working in said slot.

5. A dental hand piece including` an outer sleeve, an inner sleeve fitted into the outer sleeve and having a limited lengthwise move ment relative thereto, a shaft fitted into said inner sleeve, means connected to one end of the shaft through which said shaft may be connected to a driving means, the other end of said shaft having,` an outwardly tapering socket, and a transverse slot, a chuck formed to tit into said socket, a chuck collar slidable cn the shaft, a pin working through said slot and connected to said chuck and collar, an annular shoulder formed within the inner sleeve on one side of said chuck collar, and a release collar fastened in said inner sleeve on the other side of said chuck collar, said shoulder and release collar being` spaced from the chuck collar, on each side, to permit a limited movement of the inner sleeve independent of the chuck, said chuck collar, annular shoulder and release collar, forming means for actuating' the chuck from the inner sleeve.

6, dental hand piece including an outer sleeve. an inner sleeve fitted into the outer sleeve, and having a limited lengthwise movement relative thereto, a shaft fitted into said inner sleeve, means connected to one end of the shaft through which said shaft may be connected to a driving means, the other end of said shaft .having an outwardly tapering socket, a chuck formed to lit into said socket, a chuck collar slidable on the shaft, and connected to the chuck, an annular shoulder formed Withiny the inner sleeve on one side of the chuck collar, a release collar Within the inner sleeve on the other side of the Chuck collar, said shoulder and collars forming means for moving the chuck from the innerI sleeve, said shoulder and release Collar being spaced apart to permit a limited movement of the inner sleeve, independent of the ohuelr, one of said sleeves having a T-slot. formed with an intermediate lateral notch a stud threaded through the other sleeve, and also through said release collar, said stud being movable in said notch to permit the relative lengthwise movement of said sleeves, said stud when seated in said noteh looking said sleeves against relative length 15 ROBERT E. GRAVES.

Witnesses:

W. H. DUNLAY, E. V. HARDWAY. 

